Method and apparatus for transmitting reference signal

ABSTRACT

The present invention provides a method for transmitting reference signals comprising: during carrier aggregation, a user equipment sending physical uplink shared channel (PUSCH) on one or more component carriers, and sending demodulation reference signals (DM RS) for the PUSCH on each section of bandwidth occupied by the PUSCH on each component carrier, wherein a DM RS sequence on a section of bandwidth is an independent sequence or part of an independent sequence and forms an independent sequence with DM RS sequences on multiple sections of bandwidth other than the section of bandwidth; the section of bandwidth is a section of continuous bandwidth occupied by the PUSCH on any component carrier, or is any of the multiple sections of bandwidth occupied by the PUSCH on any component carrier. The Present invention further provides a corresponding apparatus.

TECHNICAL FIELD

The present invention relates to the field of mobile communication, andmore particularly, to a method and an apparatus for transmittingreference signals.

BACKGROUND OF THE RELATED ART

In the third Generation Partnership Project Long Term Evolution (3GPPLTE) system, uplink resource allocation takes a physical resource block(PRB for short) as a unit. One PRB occupies N_(SC) ^(RB) continuoussubcarriers in frequency domain, and occupies N_(symb) ^(UL) continuoussubcarriers in time domain. N_(SC) ^(RB)=12, and a subcarrier intervalis 15 kHz, that is, the width of a PRB in frequency domain is 180 kHz.For a normal cyclic prefix (Normal CP for short), N_(symb) ^(UL)=7, andfor an extended cyclic prefix (Extended CP for short), N_(symb) ^(UL)=6,that is, the length of a PRB in time domain is a slot (0.5 ms). Thus, aPRB comprises N_(symb) ^(UL)×N_(SC) ^(RB) resource elements (RE forshort). In one slot, an index of a PRB is n_(PRB), where n_(PRB)=0, . .. , N_(RB) ^(UL)−1, and N_(RB) ^(UL) is the number of PRBs correspondingto the uplink system bandwidth; an index pair of a RE is (k,l), wherek=0, . . . , N_(RB) ^(UL)N_(sc) ^(RB)−1 is an index in frequency domain,and l=0, . . . , N_(symb) ^(UL)−1 is an index in time domain, then

$n_{PRB} = \left\lfloor \frac{k}{N_{SC}^{RB}} \right\rfloor$

Taking the normal CP as an example, the structure of the PRB is shown inFIG. 1.

As shown in FIG. 2, in the LTE system, Physical Uplink Shared Channels(PUSCH) of a plurality of User Equipments (UE) in a cellfrequency-division multiplex the uplink system bandwidth, that is, thePUSCHs of different UEs are orthogonal in frequency domain and occupydifferent physical resource blocks. However, resource allocation uses alocalized allocation method, that is, the PUSCH of one UE occupies asection of continuous bandwidth in frequency domain, which is a part ofthe entire uplink system bandwidth. The section of bandwidth contains aset of continuous PRBs, the number of which is M_(RB) ^(PUSCH), and thenumber of its contained continuous subcarriers is

M _(sc) ^(PUSCH) =M _(RB) ^(PUSCH) ·N _(sc) ^(RB)

Uplink reference signals in the LTE system are divided into demodulationreference signals (DM RS) and Sounding Reference Signals (SRS). The DMRSs are further divided into DM RSs for the PUSCH and DM RSs for thePhysical Uplink Control Channel (PUCCH). All the uplink referencesignals are reference signal sequences in the same form.

An uplink reference signal sequence r_(u,v) ^((α))(n) in the LTE systemis defined as cyclic shift of a base sequence r _(u,v)(n)

r _(u,v) ^((α))(n)=e ^(jan) r _(u,v)(n), 0≦n≦MR _(sc) ^(RS)−1

where MR_(sc) ^(RS)=mN_(sc) ^(RB) is the length of the reference signalsequence, 1≦m≦N_(RB) ^(max,UL). A different cyclic shift quantity α isused for the base sequence r _(u,v)(n), and a plurality of referencesignal sequences can be defined.

The definition of the base sequence r _(u,v)(n) depends on the sequencelength M_(sc) ^(RS).

If M_(sc) ^(RS)≧3N_(sc) ^(RB),

r _(u,v)(n)=x _(q)(n mod N _(ZC) ^(RS)), 0≦n≦M _(sc) ^(RS)−1

where the q^(th) Zadoff-Chu sequence (ZC sequence for short) is definedas

${{x_{q}(m)} = ^{{- j}\frac{\pi \; {{qm}{({m + 1})}}}{N_{ZC}^{RS}}}},{0 \leq m \leq {N_{ZC}^{RS} - 1}}$

and q is given by the following equation,

q=└ q+1/2┘+v·(−1)^(└2 q┘)

q=N _(ZC) ^(RS)·(u+1)/31

the length N_(ZC) ^(RS) of the ZC sequence is the largest prime numbersatisfying N_(ZC) ^(RS)<M_(sc) ^(RS), that is, the ZC sequence with thelength of N_(ZC) ^(RS) forms the base sequence with the length of M_(sc)^(RS) by cyclic shift.

If M_(sc) ^(RS)=N_(sc) ^(RB) or M_(sc) ^(RS)=2N_(sc) ^(RB),

r _(u,v)(n)=e ^(jφ(n)π/4), 0≦n≦M _(sc) ^(RS)−1

where values of φ(n) are given in Table 1 and Table 2 respectively.

TABLE 1 u φ(0), . . . , φ(11) 0 −1 1 3 −3 3 3 1 1 3 1 −3 3 1 1 1 3 3 3−1 1 −3 −3 1 −3 3 2 1 1 −3 −3 −3 −1 −3 −3 1 −3 1 −1 3 −1 1 1 1 1 −1 −3−3 1 −3 3 −1 4 −1 3 1 −1 1 −1 −3 −1 1 −1 1 3 5 1 −3 3 −1 −1 1 1 −1 −1 3−3 1 6 −1 3 −3 −3 −3 3 1 −1 3 3 −3 1 7 −3 −1 −1 −1 1 −3 3 −1 1 −3 3 1 81 −3 3 1 −1 −1 −1 1 1 3 −1 1 9 1 −3 −1 3 3 −1 −3 1 1 1 1 1 10 −1 3 −1 11 −3 −3 −1 −3 −3 3 −1 11 3 1 −1 −1 3 3 −3 1 3 1 3 3 12 1 −3 1 1 −3 1 1 1−3 −3 −3 1 13 3 3 −3 3 −3 1 1 3 −1 −3 3 3 14 −3 1 −1 −3 −1 3 1 3 3 3 −11 15 3 −1 1 −3 −1 −1 1 1 3 1 −1 −3 16 1 3 1 −1 1 3 3 3 −1 −1 3 −1 17 −31 1 3 −3 3 −3 −3 3 1 3 −1 18 −3 3 1 1 −3 1 −3 −3 −1 −1 1 −3 19 −1 3 1 31 −1 −1 3 −3 −1 −3 −1 20 −1 −3 1 1 1 1 3 1 −1 1 −3 −1 21 −1 3 −1 1 −3 −3−3 −3 −3 1 −1 −3 22 1 1 −3 −3 −3 −3 −1 3 −3 1 −3 3 23 1 1 −1 −3 −1 −3 1−1 1 3 −1 1 24 1 1 3 1 3 3 −1 1 −1 −3 −3 1 25 1 −3 3 3 1 3 3 1 −3 −1 −13 26 1 3 −3 −3 3 −3 1 −1 −1 3 −1 −3 27 −3 −1 −3 −1 −3 3 1 −1 1 3 −3 −328 −1 3 −3 3 −1 3 3 −3 3 3 −1 −1 29 3 −3 −3 −1 −1 −3 −1 3 −3 3 1 −1

TABLE 2 u φ(0), . . . , φ(23) 0 −1 3 1 −3 3 −1 1 3 −3 3 1 3 −3 3 1 1 −11 3 −3 3 −3 −1 −3 1 −3 3 −3 −3 −3 1 −3 −3 3 −1 1 1 1 3 1 −1 3 −3 −3 1 31 1 −3 2 3 −1 3 3 1 1 −3 3 3 3 3 1 −1 3 −1 1 1 −1 −3 −1 −1 1 3 3 3 −1 −31 1 3 −3 1 1 −3 −1 −1 1 3 1 3 1 −1 3 1 1 −3 −1 −3 −1 4 −1 −1 −1 −3 −3 −11 1 3 3 −1 3 −1 1 −1 −3 1 −1 −3 −3 1 −3 −1 −1 5 −3 1 1 3 −1 1 3 1 −3 1−3 1 1 −1 −1 3 −1 −3 3 −3 −3 −3 1 1 6 1 1 −1 −1 3 −3 −3 3 −3 1 −1 −1 1−1 1 1 −1 −3 −1 1 −1 3 −1 −3 7 −3 3 3 −1 −1 −3 −1 3 1 3 1 3 1 1 −1 3 1−1 1 3 −3 −1 −1 1 8 −3 1 3 −3 1 −1 −3 3 −3 3 −1 −1 −1 −1 1 −3 −3 −3 1 −3−3 −3 1 −3 9 1 1 −3 3 3 −1 −3 −1 3 −3 3 3 3 −1 1 1 −3 1 −1 1 1 −3 1 1 10−1 1 −3 −3 3 −1 3 −1 −1 −3 −3 −3 −1 −3 −3 1 −1 1 3 3 −1 1 −1 3 11 1 3 3−3 −3 1 3 1 −1 −3 −3 −3 3 3 −3 3 3 −1 −3 3 −1 1 −3 1 12 1 3 3 1 1 1 −1−1 1 −3 3 −1 1 1 −3 3 3 −1 −3 3 −3 −1 −3 −1 13 3 −1 −1 −1 −1 −3 −1 3 3 1−1 1 3 3 3 −1 1 1 −3 1 3 −1 −3 3 14 −3 −3 3 1 3 1 −3 3 1 3 1 1 3 3 −1 −1−3 1 −3 −1 3 1 1 3 15 −1 −1 1 −3 1 3 −3 1 −1 −3 −1 3 1 3 1 −1 −3 −3 −1−1 −3 −3 −3 −1 16 −1 −3 3 −1 −1 −1 −1 1 1 −3 3 1 3 3 1 −1 1 −3 1 −3 1 1−3 −1 17 1 3 −1 3 3 −1 −3 1 −1 −3 3 3 3 −1 1 1 3 −1 −3 −1 3 −1 −1 −1 181 1 1 1 1 −1 3 −1 −3 1 1 3 −3 1 −3 −1 1 1 −3 −3 3 1 1 −3 19 1 3 3 1 −1−3 3 −1 3 3 3 −3 1 −1 1 −1 −3 −1 1 3 −1 3 −3 −3 20 −1 −3 3 −3 −3 −3 −1−1 −3 −1 −3 3 1 3 −3 −1 3 −1 1 −1 3 −3 1 −1 21 −3 −3 1 1 −1 1 −1 1 −1 31 −3 −1 1 −1 1 −1 −1 3 3 −3 −1 1 −3 22 −3 −1 −3 3 1 −1 −3 −1 −3 −3 3 −33 −3 −1 1 3 1 −3 1 3 3 −1 −3 23 −1 −1 −1 −1 3 3 3 1 3 3 −3 1 3 −1 3 −1 33 −3 3 1 −1 3 3 24 1 −1 3 3 −1 −3 3 −3 −1 −1 3 −1 3 −1 −1 1 1 1 1 −1 −1−3 −1 3 25 1 −1 1 −1 3 −1 3 1 1 −1 −1 −3 1 1 −3 1 3 −3 1 1 −3 −3 −1 −126 −3 −1 1 3 1 1 −3 −1 −1 −3 3 −3 3 1 −3 3 −3 1 −1 1 −3 1 1 1 27 −1 −3 33 1 1 3 −1 −3 −1 −1 −1 3 1 −3 −3 −1 3 −3 −1 −3 −1 −3 −1 28 −1 −3 −1 −1 1−3 −1 −1 1 −1 −3 1 1 −3 1 −3 −3 3 1 1 −1 3 −1 −1 29 1 1 −1 −1 −3 −1 3 −13 −1 1 3 1 −1 3 1 3 −3 −3 1 −1 −1 1 3

The base sequence r _(u,v)(n) is divided into 30 groups, uε{0, 1, . . ., 29} is a group serial number, and v is an intragroup sequence serialnumber. Each group contains base sequences with all lengths from M_(sc)^(RS)=N_(sc) ^(RB) to M_(sc) ^(RS)=N_(RB) ^(max,UL)·N_(sc) ^(RB), wherethere is only one base sequence (v=0) with sequence length satisfyingN_(sc) ^(RB)≦M_(sc) ^(RS)≦5N_(sc) ^(RB) for each length, and there aretwo base sequences (v=0, 1) with sequence length satisfying 6N_(sc)^(RB)≦M_(sc) ^(RS)≦N_(RB) ^(max,UL)·N_(sc) ^(RB) for each length. Thegroup serial number u and the intragroup sequence serial number v mayvary with the time to achieve group hopping and sequence hopping.

The group serial number u of the base sequence used in a slot n_(s) isdefined by a group hopping pattern f_(gh)(n_(s)) and a sequence-shiftpattern f_(ss) according to the following equation

u=(f _(gh)(n _(s))+f _(ss)) mod 30

There are 17 group hopping patterns and 30 sequence-shift patterns.

The group hopping function can notify the high layer signaling to turnon or off. The group hopping pattern f_(gh)(n_(s)) is:

${f_{gh}\left( n_{s} \right)} = \left\{ \begin{matrix}0 & \begin{matrix}{{{group}\mspace{14mu} {hopping}}\mspace{14mu}} \\{\; {{function}\mspace{14mu} {being}\mspace{14mu} {off}}}\end{matrix} \\{\left( {\sum\limits_{i = 0}^{7}{{c\left( {{8n_{s}} + i} \right)} \cdot 2^{i}}} \right){mod}\; 30} & \begin{matrix}{{{group}\mspace{14mu} {hopping}}\mspace{14mu}} \\{\; {{function}\mspace{14mu} {being}\mspace{14mu} {on}}}\end{matrix}\end{matrix} \right.$

In a radio frame, n_(s)=0, 1, . . . , 19; c(i) is a pseudo-randomsequence which is initialized at the beginning of each frame, theinitial value is

${c_{init} = \left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor},$

and N_(ID) ^(cell) is a physical layer cell ID.

The PUCCH and the PUSCH have the same group hopping pattern butdifferent sequence-shift patterns.

The sequence-shift pattern f_(ss) ^(PUCCH) of the PUCCH is:

f_(ss) ^(PUCCH)=N_(ID) ^(cell) mod 30

The sequence-shift pattern f_(ss) ^(PUCCH) of the PUSCH is:

f _(ss) ^(PUSCH)=(f _(ss) ^(PUCCH)+Δ_(ss)) mod 30

where Δ_(ss)ε{0, 1, . . . , 29} is configured by the high layer.

Sequence hopping is only used when the length of the reference signalsequence is M_(sc) ^(RS)≦6N_(sc) ^(RB).

When the length of the reference signal sequence is M_(sc) ^(RS)<6N_(sc)^(RB), there is only one base sequence with length of M_(sc) ^(RS) ineach group, and the intragroup sequence serial number of the basesequence is v=0.

When the length of the reference signal sequence is N_(sc) ^(RS)≧6N_(sc)^(RB), there are two base sequences with length of v=0, 1, and theintragroup sequence serial number of the base sequence used in the slotn_(s) is,

$v = \left\{ \begin{matrix}{c\left( n_{s} \right)} & \begin{matrix}{{{if}\mspace{14mu} {group}\mspace{14mu} {hopping}\mspace{14mu} {function}\mspace{14mu} {is}\mspace{14mu} {off}},} \\{{sequence}\mspace{14mu} {hopping}\mspace{14mu} {function}\mspace{14mu} {is}\mspace{14mu} {on}}\end{matrix} \\0 & {otherwise}\end{matrix} \right.$

where in a radio frame, n_(s)=0, 1, . . . , 19, and c(i) is apseudo-random sequence which is initialized at the beginning of eachframe, and the initial value is

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + {f_{ss}^{PUSCH}.}}$

A DM RS sequence r^(PUSCH)(•) for the PUSCH is defined as

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0, 1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(RS)=M_(sc) ^(PUSCH)

m=0, 1 correspond to two slots in one subframe (with the length of 1 ms)respectively.

In the slot n_(s), the cyclic shift quantity α is:

α=2πn _(cs)/12

where

n _(cs)=(n _(DMRS) ⁽¹⁾ +n _(DMRS) ⁽²⁾ +n _(PRS)(n _(s))) mod 12

n_(DMRS) ⁽¹⁾ is configured with high layer parameters, and n_(DMRS) ⁽²⁾is configured with system signaling,

n _(PRS)(n _(s))=Σ_(i=0) ⁷ c(8N _(symb) ^(UL) ·n _(s) +i)·2^(i)

where in a radio frame, n_(s)=0, 1, . . . , 19; c(i) is a pseudo-randomsequence which is initialized at the beginning of each frame, and itsinitial value is

$c_{init} = {{\left\lfloor \frac{N_{ID}^{cell}}{30} \right\rfloor \cdot 2^{5}} + {f_{ss}^{PUSCH}.}}$

The structure of the DM RS of the PUSCH is shown in FIG. 3 and FIG. 4.After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β^(PUSCH), starting with r^(PUSCH) (0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for correspondingPUSCH transmission. When the sequence r^(PUSCH)(•) is mapped to RE (k,l)of a subframe, the mapping is performed first in frequency domain (k)and then in time-domain (l) in an ascending order of k and l. The DM RSin each slot is always located at the fourth one (l=3) of seven normalCP symbols or the third one (l=2) of six extended CP symbols in thisslot.

Since the DM RSs of the PUSCH of each UE are sent within thetransmission bandwidth of the PUSCH of the UE and the PUSCHs of all UEsin the cell are orthogonal with each other in frequency domain, thecorresponding DM RSs are orthogonal with each other in frequency domainas well.

The LTE-Advanced system (LTE-A system for short) is a next-generationevolution system of the LTE system. As shown in FIG. 5, the LTE-A systemextends the transmission bandwidth using the carrier aggregationtechnology, and each aggregated carrier is called as a componentcarrier. A plurality of component carriers might be continuous ornon-continuous, and they might be in the same frequency band ordifferent frequency bands.

During carrier aggregation, when a UE sends the PUSCH on a plurality ofcomponent carriers, how to send the demodulation reference signals (DMRS) has become a problem to be solved urgently.

In addition, in the LTE-A systems, the PUSCH of a UE within a componentcarrier might use continuous or non-continuous resource allocationmethod according to instruction of the system signaling. By continuousresource allocation, it is meant that localized resource allocationmethod, i.e., a PUSCH transmit signal of the UE occupies a section ofcontinuous bandwidth within a component carrier; by non-continuousresource allocation, it is meant that the PUSCH transmit signal of theUE occupies multiple sections of bandwidths within a component carrier,and these sections of bandwidth are non-continuous, and each section ofbandwidth contains a set of continuous PRBs.

For the PUSCH in the non-continuous resource allocation, how to send thedemodulation reference signals (DM RS) has become a problem required tobe solved.

Content of the Invention

A technical problem to be solved by the present invention is to providea method and an apparatus for transmitting reference signals so as tosolve the problem of transmitting demodulation reference signals (DM RS)when a user equipment transmits the PUSCH on a plurality of componentcarriers as well as on multiple sections of bandwidth in one componentcarrier.

In order to solve the aforementioned technical problem, the presentinvention provides a method for transmitting reference signalscomprising: during carrier aggregation, a user equipment sendingphysical uplink shared channel (PUSCH) on one or more componentcarriers, and sending demodulation reference signals (DM RS) for thePUSCH on each section of bandwidth occupied by the PUSCH on eachcomponent carrier, wherein a DM RS sequence on a section of bandwidth isan independent sequence or part of an independent sequence and forms anindependent sequence with DM RS sequences on multiple sections ofbandwidth other than the section of bandwidth; the section of bandwidthis a section of continuous bandwidth occupied by the PUSCH on anycomponent carrier, or is any of the multiple sections of bandwidthoccupied by the PUSCH on any component carrier.

The method might also have the following feature: the DM RS sequences onthe multiple sections of bandwidth occupied by the PUSCH on the samecomponent carrier form an independent sequence, and the DM RS sequenceon each section of bandwidth is part of the independent sequence.

The method might also have the following feature: the DM RS sequence oneach section of bandwidth occupied by the PUSCH on each componentcarrier is an independent sequence.

The method might also have the following feature: a base sequence of theDM RS sequence on each section of bandwidth comes from the same or adifferent group, when a group hopping function is on, a group serialnumber u of the DM RS sequence on each section of bandwidth varies witha slot in one radio frame, and a group hopping pattern of the DM RSsequence on each section of bandwidth is the same or different.

The method might also have the following feature: in the same slot, ifbase sequences of a plurality of independent sequences come from thesame group and have the same cyclic shift quantity, and lengths of thesequences are the same and greater than or equal to 6N_(sc) ^(RB), whereN_(sc) ^(RB) is the number of subcarriers occupied by one physicalresource block in frequency domain, then the intragroup sequence serialnumbers of the base sequences of the plurality of independent sequencesare the same or different, when the group hopping function is off whilethe sequence hopping function is on, sequence hopping patterns of theplurality of independent sequences are the same or different, and theindependent sequence is a DM RS sequence on a section of bandwidth or asequence formed collectively from DM RS sequences on multiple sectionsof bandwidth.

The method might also have the following feature: if base sequences oftwo independent sequences come from the same group and have the samecyclic shift quantity, and lengths of the two independent sequences arethe same and greater than or equal to 6N_(sc) ^(RB), where N_(sc) ^(RB)is the number of subcarriers occupied by one physical resource block infrequency domain, then the intragroup sequence serial numbersv_(i),v_(j)ε{0,1} of the two independent sequences satisfyv_(i)=(v_(j)+1) mod 2; if the group hopping function is off while thesequence hopping function is on, sequence hopping patterns of the twoindependent sequences satisfy v_(i)(n_(s))=(v_(j)(n_(s))+1) mod 2, andeach of the independent sequences is a DM RS sequence on a section ofbandwidth or a sequence formed collectively from DM RS sequences onmultiple sections of bandwidth.

The method might also have the following feature: when the DM RSsequence on the section of bandwidth is an independent sequence, the DMRS sequence r^(PUSCH)(•) on the section of bandwidth is:

r ^(PUSCH)(m·M _(SC) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0, 1

n=0, . . . , M _(sc) ^(RS)−1

and the sequence length M_(sc) ^(RS) is the number of subcarriers M_(sc)^(PUSCH) corresponding to the section of bandwidth, m=0, 1 correspond totwo slots in one subframe respectively, α is the cyclic shift quantity,u is the group serial number, and v is the intragroup sequence serialnumber.

The method might also have the following feature: when DM RS sequenceson R sections of bandwidth are part of the independent sequencer^(PUSCH)(•), r^(PUSCH)(•) is

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0, 1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(RS)=M_(sc) ^(PUSCH)

where r_(u,v)(n) is the base sequence, α is the cyclic shift quantity, uis the group serial number, v is the intragroup sequence serial number;m=0, 1 correspond to two slots in a subframe respectively, and M_(sc)^(PUSCH) is the total number of subcarriers corresponding to the Rsections of bandwidth.

The DM RS sequence r^(PUSCH,r)(•) on the r^(th) section of bandwidth ofthe R sections of bandwidths is:

${r^{{PUSCH},r}\left( {{m \cdot M_{sc}^{{PUSCH},r}} + n} \right)} = {r^{PUSCH}\left( {{m \cdot M_{sc}^{RS}} + {\sum\limits_{i = 0}^{r - 1}M_{sc}^{{PUSCH},i}} + n} \right)}$

where

r=1, . . . , R−1

m=0, 1

n=0, . . . , M _(sc) ^(PUSCH,r)−1

the DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth is:

r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)

where

m=0, 1

n=0, . . . , M _(sc) ^(PUSCH,0)−1

M_(sc) ^(PUSCH,r) is the number of subcarriers corresponding to ther^(th) section of bandwidth.

The method might also have the following feature: after the sequencer^(PUSCH)(•) is multiplied by a magnitude scaling factor β_(PUSCH),starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•) is mapped to thesame physical resource block set for corresponding PUSCH transmission,when the sequence r^(PUSCH)(•) is mapped to RE(k,l) of a subframe, themapping is performed first in frequency domain (k) and then intime-domain (l) in an ascending order of k and l, the DM RS for thePUSCH in each slot is located at the fourth one (l=3) of seven normalcyclic prefix symbols or the third one (l=2) of six extended cyclicprefix symbols.

The present invention also provides an apparatus for transmittingreference signals configured to: during carrier aggregation, senddemodulation reference signals (DM RS) for PUSCH on each section ofbandwidth occupied by the PUSCH on each component carrier, wherein a DMRS sequence on a section of bandwidth is an independent sequence or partof an independent sequence and forms an independent sequence with DM RSsequences on multiple sections of bandwidth other than the section ofbandwidth; the section of bandwidth is a section of continuous bandwidthoccupied by the PUSCH on any component carrier, or is any of themultiple sections of bandwidth occupied by the PUSCH on any componentcarrier.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: the DM RSsequences on the multiple sections of bandwidth occupied by the PUSCH onthe same component carrier form an independent sequence, and the DM RSsequence on each section of bandwidth is part of the independentsequence.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus on each section of bandwidth occupied by the PUSCHon each component carrier is an independent sequence.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: a basesequence of the DM RS sequence on each section of bandwidth comes fromthe same or a different group, when a group hopping function is on, agroup serial number u of the DM RS sequence on each section of bandwidthvaries with a slot in one radio frame, and a group hopping pattern ofthe DM RS sequence on each section of bandwidth is the same ordifferent.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: in the sameslot, if base sequences of a plurality of independent sequences comefrom the same group and have the same cyclic shift quantity, and lengthsof the sequences are the same and greater than or equal to 6N_(sc)^(RB), where N_(sc) ^(RB) is the number of subcarriers occupied by onephysical resource block in frequency domain, then the intragroupsequence serial numbers of the base sequences of the plurality ofindependent sequences are the same or different, when the group hoppingfunction is off while the sequence hopping function is on, the sequencehopping patterns of the plurality of independent sequences are the sameor different, and the independent sequence is a DM RS sequence on asection of bandwidth or a sequence formed collectively from DM RSsequences on multiple sections of bandwidth.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: if basesequences of two independent sequences come from the same group and havethe same cyclic shift quantity, and lengths of the two independentsequences are the same and greater than or equal to 6N_(sc) ^(RB), whereN_(sc) ^(RB) is the number of subcarriers occupied by one physicalresource block in frequency domain, then the intragroup sequence serialnumbers v_(i),v_(j)ε{0,1} of the two independent sequences satisfyv_(i)=(v_(j)+1) mod 2; if the group hopping function is off while thesequence hopping function is on, sequence hopping patterns of the twoindependent sequences satisfy v_(i)(n_(s))=(v_(j)(n_(s))+1) mod 2, andeach of the independent sequences is a DM RS sequence on a section ofbandwidth or a sequence formed collectively from DM RS sequences onmultiple sections of bandwidth.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: when the DM RSsequence on the section of bandwidth is an independent sequence, the DMRS sequence r^(PUSCH)(•) on the section of bandwidth is:

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0, 1

n=0, . . . , M _(sc) ^(RS)−1

and the sequence length M_(sc) ^(RS) is the number of subcarriers M_(sv)^(PUSCH) corresponding to the section of bandwidth, m=0, 1 correspond totwo slots in one subframe respectively, α is the cyclic shift quantity,u is the group serial number, and v is the intragroup sequence serialnumber.

The apparatus might also have the following feature: the DM RS sequencesent by the apparatus satisfies the following conditions: when DM RSsequences on R sections of bandwidth are part of the independentsequence r^(PUSCH)(•), r^(PUSCH)(•) is

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((a))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(RS)=M_(sc) ^(PUSCH)

where r_(u,v)(n) is the base sequence, α is the cyclic shift quantity, uis the group serial number, v is the intragroup sequence serial number;m=0,1 correspond to two slots in a subframe respectively, and M_(sc)^(PUSCH) is the total number of subcarriers corresponding to the Rsections of bandwidth.

The DM RS sequence r^(PUSCH,r)(•) on the r^(th) section of bandwidth ofthe R sections of bandwidths is:

${r^{{PUSCH},r}\left( {{m \cdot M_{sc}^{{PUSCH},r}} + n} \right)} = {r^{PUSCH}\left( {{m \cdot M_{sc}^{RS}} + {\sum\limits_{i = 0}^{r - 1}M_{sc}^{{PUSCH},i}} + n} \right)}$

where

r=1, . . . , R−1

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,r)−1

the DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth is:

r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,0)−1

M_(sc) ^(PUSCH,r) is the number of subcarriers corresponding to ther^(th) section of bandwidth.

The apparatus might also have the following feature: the apparatus isfurther configured to: after the sequence r^(PUSCH)(•) is multiplied bya magnitude scaling factor β_(PUSCH), starting with r^(PUSCH)(0) map thesequence r^(PUSCH)(•) to the same physical resource block set forcorresponding PUSCH transmission, and when the sequence r^(PUSCH)(•) ismapped to RE (k,l) of a subframe, perform the mapping first in frequencydomain and then in time-domain in an ascending order of k and l, the DMRS for the PUSCH in each slot being located at the fourth one (l=3) ofseven normal cyclic prefix symbols or the third one (l=2) of sixextended cyclic prefix symbols.

The method and apparatus for transmitting reference signals inaccordance with the present invention solve the problem of transmittingdemodulation reference signals (DM RS) of the PUSCH when a plurality ofcomponent carriers aggregate as well as the problem of transmitting theDM RSs during PUSCH non-continuous resource allocation in one componentcarrier in the LTE-A system.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings, which provide further understanding of thepresent invention and form a part of the specification, are used toexplain the present invention along with the embodiments of the presentinvention and are not intended to limit the present invention. In theaccompanying drawings:

FIG. 1 is a structural diagram of a physical resource block in the LTEsystem (taking the normal cyclic prefix as example);

FIG. 2 is a structural diagram of a physical uplink shared channel inthe LTE system (taking the normal cyclic prefix as example);

FIG. 3 is a diagram of a slot location of a demodulation referencesignal of the physical uplink shared channel in the LTE system;

FIG. 4 is a structural diagram of a demodulation reference signal of thephysical uplink shared channel in the LTE system (taking the normalcyclic prefix as example);

FIG. 5 is a diagram of carrier aggregation in the LTE-A system;

FIG. 6 is a structural diagram of a demodulation reference signal inaccordance with the first embodiment of the present invention;

FIG. 7 is a structural diagram of a demodulation reference signal inaccordance with the second embodiment of the present invention;

FIG. 8 is a structural diagram of a demodulation reference signal inaccordance with the third embodiment of the present invention; and

FIG. 9 is a structural diagram of a demodulation reference signal inaccordance with the fourth embodiment of the present invention.

PREFERRED EMBODIMENTS OF THE PRESENT INVENTION

The method for transmitting reference signals in accordance with thepresent invention will be described below.

During carrier aggregation, a user equipment sends the physical uplinkshared channel (PUSCH) on one or more component carriers, and sendsdemodulation reference signals (DM RS) for the PUSCH on each section ofbandwidth occupied by the PUSCH on each component carrier, wherein a DMRS sequence on a section of bandwidth is an independent sequence or partof an independent sequence and forms an independent sequence with DM RSsequences on multiple sections of bandwidth other than the section ofbandwidth; the section of bandwidth is a section of continuous bandwidthoccupied by the PUSCH on any component carrier, or is any of themultiple sections of bandwidth occupied by the PUSCH on any componentcarrier.

The specific possible situations will be described below.

1) A DM RS sequence on each section of bandwidth is an independentsequence.

When a user equipment sends the PUSCH on a plurality of componentcarriers, for each of the plurality of component carriers, when thePUSCH on the component carrier occupies a section of continuousbandwidth, the DM RS sequence on the section of continuous bandwidth isan independent sequence; when the PUSCH on the component carrieroccupies multiple sections of bandwidth, the DM RS sequence on each ofthe multiple sections of bandwidth occupied by the PUSCH on thecomponent carrier is an independent sequence. When the PUSCH on eachcomponent carrier occupies a section of continuous bandwidth, the DM RSsequence on each component carrier is an independent sequence.

When the UE sends the PUSCH on a component carrier, and the PUSCH onthis component carrier occupies multiple sections of bandwidth, the DMRS sequence on each of the multiple sections of bandwidth occupied bythe PUSCH on the component carrier is an independent sequence.

2) A DM RS sequence on part of bandwidth is part of an independentsequence. DM RS sequences on multiple sections of bandwidth form anindependent sequence. The DM RS sequence on part of bandwidth is theindependent sequence means that:

a) A DM RS sequence on the same component carrier is an independentsequence.

When a user equipment sends the PUSCH on a plurality of componentcarriers, for each of the plurality of component carriers, when thePUSCH on the component carrier occupies a section of continuousbandwidth, the DM RS sequence on the section of continuous bandwidth isan independent sequence; when the PUSCH on the component carrieroccupies multiple sections of bandwidth, DM RS sequences on the multiplesections of bandwidth occupied by the PUSCH on the component carrierform an independent sequence, and the DM RS sequence on each section ofbandwidth is part of the independent sequence. The following specialcase is excluded: when the PUSCH on each component carrier occupies asection of continuous bandwidth, the DM RS sequence on each componentcarrier is an independent sequence. This specific case is included in(1).

When the UE sends the PUSCH on a component carrier, and the PUSCH on thecomponent carrier occupies multiple sections of bandwidth, DM RSsequences on the multiple sections of bandwidth occupied by the PUSCH onthe component carrier form an independent sequence, and the DM RSsequence on each section of bandwidth is part of the independentsequence.

b) At least a DM RS sequence on one component carrier is part of anindependent sequence, and at least a DM RS sequence on one section ofbandwidth is an independent sequence.

For example, each of the PUSCHs on two component carriers occupies asection of continuous bandwidth, and DM RS sequences on two sections ofbandwidth form an independent sequence, the PUSCH on another componentcarrier occupies a section of continuous bandwidth, on which a DM RSsequence is an independent sequence.

As another example, the PUSCH on a component carrier occupies threesections of bandwidth, on two of which DM RS sequences form anindependent sequence, and a DM RS sequence on the third section ofbandwidth is an independent sequence.

The above description is only exemplary.

3) DM RS sequences on all sections of bandwidth form an independentsequence.

That is, when the UE sends the PUSCH on one or more component carriers,a DM RS sequence on each of all sections of bandwidth occupied by thePUSCH on each component carrier is part of the same independentsequence.

A cyclic shift quantity a of the DM RS sequence on each section ofbandwidth might be the same or different.

A base sequence of the DM RS sequence on each section of bandwidth maycome from the same group, that is, have the same group serial number u;or come from a different group, that is, have the different group serialnumber u. If the group hopping function is on, a group hopping patternof the DM RS sequence on each section of bandwidth might be the same ordifferent.

When the length of the independent sequence consisting of one or more DMRS sequences satisfies M_(sc) ^(RS)<6N_(sc) ^(RB), there is only onebase sequence of the independent sequence with this length in eachgroup, the intragroup sequence serial number of the base sequence of theindependent sequence is v=0; when the length of the independent sequenceconsisting of one or more DM RS sequences satisfies M_(sc) ^(RS)6N_(sc)^(RB), there are two base sequences of the independent sequence withthis length in each group, the intragroup sequence serial numbers of thebase sequences of the independent sequences are v=0,1.

In the same slot, if base sequences of a plurality of independentsequences come from the same group and have the same cyclic shiftquantity, and their sequence lengths are the same and satisfy M_(sc)^(RS)≧6N_(sc) ^(RB), the intragroup sequence serial number v of the basesequences of the plurality of independent sequences might be the same ordifferent. If the group hopping function is off while the sequencehopping function is on, sequence hopping patterns of the plurality ofindependent sequences might be the same or different, each of theindependent sequences is a DM RS sequence on a section of bandwidth or asequence formed collectively from DM RS sequences on multiple sectionsof bandwidth.

Specifically, if base sequences of two independent sequences come fromthe same group and have the same cyclic shift quantity, and the lengthsof the two independent sequences are the same and greater than or equalto 6N_(sc) ^(RB)=72, then the intragroup sequence serial numbersv_(i),v_(j)ε{0,1} of these two independent sequences satisfy:

v _(i)=(v _(j)+1) mod 2

If the group hopping function is off while the sequence hopping functionis on, sequence hopping patterns of the two independent sequencessatisfy:

v _(i)(n _(s))=(v _(j)(n _(s))+1) mod 2

The independent sequence is a DM RS sequence on a section of bandwidthor a sequence formed collectively from DM RS sequences on multiplesections of bandwidth.

When a DM RS sequence on a section of bandwidth is an independentsequence, the DM RS sequence r^(PUSCH)(•) on the section of bandwidthis:

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and the sequence length M_(sc) ^(RS) is the number of subcarriers M_(sc)^(PUSCH) corresponding to the section of bandwidth, that is:

M_(sc) ^(RS)=M_(sc) ^(PUSCH)

m=0,1 correspond to two slots in one subframe respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for correspondingPUSCH transmission. When the sequence r^(PUSCH)(•) is mapped to RE (k,l)of a subframe, the mapping is performed first in frequency domain (k)and then in time-domain (l) in an ascending order of k and l. The DM RSfor the PUSCH in each slot is located at the fourth one (l=3) of sevennormal cyclic prefix symbols or the third one (l=2) of six extendedcyclic prefix symbols.

When a DM RS sequence on each of R sections of bandwidth is a part of anindependent sequence r^(PUSCH)(•), r^(PUSCH)(•) is defined as

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and the sequence length M_(sc) ^(RS) is the number of subcarriers M_(sc)^(PUSCH) corresponding to the R sections of bandwidth, that is:

M_(sc) ^(RS)=M_(sc) ^(PUSCH)

where M_(sc) ^(PUSCH)=M_(RB) ^(PUSCH)·N_(sc) ^(RB),

$M_{RB}^{PUSCH} = {\sum\limits_{r = 0}^{R - 1}{M_{RB}^{{PUSCH},r}.}}$

M_(RB) ^(PUSCH,r) is the number of PRBs corresponding to the r^(th)section of bandwidth. The number of subcarriers corresponding to ther^(th) section of bandwidth is

M _(sc) ^(PUSCH,r) =M _(RB) ^(PUSCH,r) ·N _(sc) ^(RB)

and

${\sum\limits_{r = 0}^{R - 1}M_{RB}^{{PUSCH},r}} = M_{sc}^{PUSCH}$

m=0,1 correspond to two slots in one subframe (1 ms) respectively.

The DM RS sequence r^(PUSCH,r)(•) on the r^(th) section of bandwidth is:

${r^{{PUSCH},r}\left( {{m \cdot M_{sc}^{{PUSCH},r}} + n} \right)} = {r^{PUSCH}\left( {{m \cdot M_{sc}^{RS}} + {\sum\limits_{i = 0}^{r - 1}M_{sc}^{{PUSCH},i}} + n} \right)}$

where

r=1, . . . , R−1

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,r)−1

Specifically, the DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section ofbandwidth is:

r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,0)−1

That is, the sequence r^(PUSCH)(•) is divided into R sections, and ther^(th) section of the sequence corresponds to the r^(th) section ofbandwidth, or other corresponding modes may be used. The length of ther^(th) section of the sequence is the number of subcarriers M_(sc)^(PUSCH,r) corresponding to the r^(th) section of bandwidth. The Rsections of bandwidth might be R sections of bandwidth on one componentcarrier; or R sections of bandwidth on R component carriers (a sectionof continuous bandwidth on each component carrier), or R sections ofbandwidth on P component carriers, where P<R, that is, the PUSCH on atleast one component carrier occupies multiple sections of non-continuousbandwidth.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for correspondingPUSCH transmission. When the sequence r^(PUSCH)(•) is mapped to RE (k,l)of a subframe, the mapping is performed first in frequency domain (k)and then in time-domain (l) in an ascending order of k and l. The DM RSfor the PUSCH in each slot is located at the fourth one (l=3) of sevennormal CP symbols or the third one (l=2) of six extended CP symbols.

The present invention will be described in detail below in conjunctionwith the embodiments and the accompanying drawings.

The First Embodiment

As shown in FIG. 6, assuming that in the LTE-A system, the PUSCH of auser equipment 1 is transmitted on a component carrier, and the uplinksystem bandwidth of this component carrier is 20 MHz, corresponds to 12PRBs and 144 subcarriers in frequency domain, and is divided into twosections of non-continuous bandwidth in frequency domain usingnon-continuous resource allocation, the two sections of bandwidthcorresponding to 4 PRBs and 48 subcarriers and 8 PRBs and 96 subcarriersrespectively.

The user equipment 1 transmits demodulation reference signals (DM RS)for the PUSCH on the two sections of bandwidth occupied by the PUSCH ofthe user equipment 1.

The DM RSs on each section of bandwidth are an independent sequence.

The DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth isdefined as

r ^(PUSCH,0)(m·M _(sc) ^(RS) +n)=r _(u,v) ₀ ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH,0)=48

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding tothe 0^(th) section of the PUSCH transmission. When the sequencer^(PUSCH)(•) is mapped to RE (k,l) of a subframe, the mapping isperformed first in frequency domain (k) and then in time-domain (l) inan ascending order of k and l. The DM RS for the PUSCH in each slot islocated at the fourth one (l=3) of seven normal CP symbols.

The DM RS sequence r^(PUSCH,1)(•) of the first section of bandwidth isdefined as

r ^(PUSCH,1)(m·M _(sc) ^(RS) +n)=r _(u,v) ₁ ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH,1)=96

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•) is mappedto the same physical resource block set for corresponding the 1^(st)section of the PUSCH transmission. When the sequence r^(PUSCH)(•) ismapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The cyclic shift quantities α of the DM RS sequences on the two sectionsof bandwidth are the same, and the group serial numbers u of the basesequences are the same. If the group hopping function is on, the groupserial numbers u of the DM RS sequences on the two sections of bandwidthvary with the slot n_(s)=0, 1, . . . , 19 in one radio frame, and grouphopping patterns are the same.

The length of the DM RS sequence on the 0^(th) section of bandwidth isM_(sc) ^(RS)=48<6N_(sc) ^(RB)=72, the intragroup sequence serial numberof the base sequence is v₀=0; the length of the DM RS sequence on the1^(st) section of bandwidth is M_(sc) ^(RS)=96>6N_(sc) ^(RB)=72, theintragroup sequence serial number of the base sequence is v₁=0 or 1. Ifthe group hopping function is off, and the sequence hopping function ison, the intragroup sequence serial number v₁ of the DM RS sequence onthe first section of bandwidth varies with the slot n_(s)=0, 1, . . . ,19 in one radio frame.

The PUSCH of the UE1 is not frequency hopping in this subframe, and thePUSCH is located at the same frequency domain position in two slots inthe subframe. Therefore, the corresponding DM RSs are also located atthe same frequency domain position in the two slots in the subframe.

The Second Embodiment

As shown in FIG. 7, assuming that in the LTE-A system, the PUSCH of auser equipment 1 is transmitted on a component carrier, and the uplinksystem bandwidth of this component carrier is 20 MHz, corresponds to 12PRBs and 144 subcarriers in frequency domain, and is divided into twosections of non-continuous bandwidth in frequency domain usingnon-continuous resource allocation, the two sections of bandwidthcorresponding to 4 PRBs and 48 subcarriers and 8 PRBs and 96 subcarriersrespectively.

The UE1 transmits demodulation reference signals (DM RS) for the PUSCHon the two sections of bandwidth occupied by the PUSCH of the UE1.

The DM RSs on each section of bandwidth are a part of an independentsequence r^(PUSCH)(•), and r^(PUSCH)(•) is defined as

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(RS)=144

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

The DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth is

r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(PUSCH,0)=48

The DM RS sequence r^(PUSCH,1)(•) on the first section of bandwidth isdefined as

r ^(PUSCH,1)(m·M _(sc) ^(PUSCH,1) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +M_(sc) ^(PUSCH,0) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,1)−1

and

M_(sc) ^(PUSCH,1)=96

that is, the sequence r^(PUSCH)(•) is divided into two sections, thelength of the 0^(th) section of the sequence is the number 48 ofsubcarriers corresponding to the 0^(th) section of the PUSCH, and thelength of the first section of the sequence is the number 96 ofsubcarriers corresponding to the first section of the PUSCH.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for correspondingPUSCH transmission. When the sequence r^(PUSCH)(•) is mapped to RE (k,l)of a subframe, the mapping is performed first in frequency domain (k)and then in time-domain (l) in an ascending order of k and l. The DM RSfor the PUSCH in each slot is located at the fourth one (l=3) of sevennormal CP symbols.

If the group hopping function is on, the group serial number u of the DMRS sequence varies with the slot n_(s)=0, 1, . . . , 19 in one radioframe.

The length of the DM RS sequence is M_(sc) ^(RS)=144>6N_(sc) ^(RB)=72,the intragroup sequence serial number of the base sequence is v=0 or 1.If the group hopping function is off, and the sequence hopping functionis on, v varies with the slot n_(s)=0, 1, . . . , 19 in one radio frame.

The PUSCH of the UE1 is not frequency hopping in the subframe, the PUSCHis located at the same frequency domain location in two slots in thesubframe. Therefore, the corresponding DM RSs are also located at thesame frequency domain location in the two slots in the subframe.

The Third Embodiment

As shown in FIG. 8, assuming that in the LTE-A system, the PUSCH of auser equipment 1 is transmitted on a component carrier, and the uplinksystem bandwidth of this component carrier is 10 MHz, corresponds to 24PRBs and 288 subcarriers in frequency domain, and is divided into threesections of non-continuous bandwidth in frequency domain usingnon-continuous resource allocation, the three sections of bandwidthcorresponding to 6 PRBs and 72 subcarriers, 12 PRBs and 144 subcarriersand 6 PRBs and 72 subcarriers respectively.

The UE1 transmits demodulation reference signals (DM RS) for the PUSCHon the three sections of bandwidth occupied by the PUSCH of the UE1.

The DM RSs on each section of bandwidth are an independent sequence.

The DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth isdefined as

r ^(PUSCH,0)(m·M _(sc) ^(RS) +n)=r _(u,v) ₀ ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

the sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH,0)=72

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0) the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the0^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence r^(PUSCH,1)(•) on the first section of bandwidth isdefined as

r ^(PUSCH,1)(m·M _(sc) ^(RS) +n)=r _(u,v) ₁ ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

the sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH,1)=144

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the1^(st) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence r^(PUSCH,2)(•) on the second section of bandwidth isdefined as

r ^(PUSCH,2)(m·M _(sc) ^(RS) +n)=r _(u,v) ₂ ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

the sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH,2)=72

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH) starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the2^(nd) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The cyclic shift quantities α of the DM RS sequences on three sectionsof bandwidth are the same, and the group serial numbers u of the basesequences are the same. If the group hopping function is on, the groupserial numbers u of the DM RS sequences on these three sections ofbandwidth vary with the slot n_(s)=0, 1, . . . , 19 in one radio frame,and group hopping patterns are the same.

The lengths of the DM RS sequences on these three sections of bandwidthsatisfy M_(sc) ^(RS)≧6N_(sc) ^(RB)=72, the intragroup sequence serialnumber of the base sequence is 0 or 1. The lengths of the DM RSsequences on the 0^(th) and 2^(nd) sections of bandwidth are the same,and in one slot, the intragroup sequence serial numbers of the DM RSsequences on the two sections of bandwidth are different, v₀≠v₂.

If the group hopping function is off, and the sequence hopping functionis on, the intragroup sequence serial numbers of the DM RS sequences onthe three sections of bandwidth vary with the slot n_(s)=0, 1, . . . ,19 in one radio frame. The sequence hopping pattern of the DM RSs on the0^(th) section of bandwidth is different from and just contrary to thatof the DM RSs on the 2^(nd) section of bandwidth, that is,

v ₀(n _(s))=(v ₂(n _(s))+1) mod 2

The PUSCH of the UE1 is frequency hopping in the subframe, the PUSCH islocated at the same frequency domain location in two slots in thesubframe. Therefore, the corresponding DM RSs are also located at thesame frequency domain location in the two slots in the subframe.

The Fourth Embodiment

As shown in FIG. 9, assuming that in the LTE-A system, the PUSCH of auser equipment 1 is transmitted on a component carrier, and the uplinksystem bandwidth of this component carrier is 10 MHz, corresponds to 24PRBs and 288 subcarriers in frequency domain, and is divided into threesections of non-continuous bandwidth in frequency domain usingnon-continuous resource allocation, the three sections of bandwidthcorresponding to 6 PRBs and 72 subcarriers, 12 PRBs and 144 subcarriersand 6 PRBs and 72 subcarriers respectively.

The UE1 transmits demodulation reference signals (DM RS) for the PUSCHon the three sections of bandwidth occupied by the PUSCH of the UE1.

The DM RSs on each section of bandwidth is a part of an independentsequence r^(PUSCH)(•), and r^(PUSCH)(•) is defined as

r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

and

M_(sc) ^(RS)=288

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

The DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth is:

r ^(PUSCH,0)(m·M ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) ++n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,0)−1

and

M_(sc) ^(PUSCH,0)=72

The DM RS sequence r^(PUSCH,1)(•) on the first section of bandwidth is

r ^(PUSCH,1)(m·M _(sc) ^(PUSCH,1) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +M_(sc) ^(PUSCH,0) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,1)−1

and

M_(sc) ^(PUSCH,1)=144

the DM RS sequence r^(PUSCH,2)(•) on the second section of bandwidth is

r ^(PUSCH,1)(m·M _(sc) ^(PUSCH2) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +M _(sc)^(PUSCH,0) +M _(sc) ^(PUSCH,1) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,2)−1

and

M_(sc) ^(PUSCH,2)=72

That is, the sequence r^(PUSCH)(•) is divided into three sections, thelength of the 0^(th) section of the sequence is the number 36 ofsubcarriers corresponding to the 0^(th) section of the PUSCH, the lengthof the 1^(st) section of the sequence is the number 72 of subcarrierscorresponding to the 1^(st) section of the PUSCH, and the length of the2^(nd) section of the sequence is the number of subcarriers 36corresponding to the 2^(nd) section of the PUSCH.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for correspondingPUSCH transmission. When the sequence r^(PUSCH)(•) is mapped to RE(k,l)of a subframe, the mapping is performed first in frequency domain (k)and then in time-domain (l) in an ascending order of k and l. The DM RSfor the PUSCH in each slot is located at the fourth one (l=3) of sevennormal CP symbols.

If the group hopping function is on, the group serial number u of the DMRS sequence varies with the slot n_(s)=0, 1, . . . , 19 in one radioframe.

The length of the DM RS sequence satisfies M_(sc) ^(RS)=288>6N_(sc)^(RB)=72, the intragroup sequence serial number of the base sequence isv=0 or 1. If the group hopping function is off, and the sequence hoppingfunction is on, v varies with the slot n_(s)=0, 1, . . . , 19 in oneradio frame.

The PUSCH of the UE1 is frequency hopping in the subframe, the PUSCH islocated at the same frequency domain location in two slots in thesubframe. Therefore, the corresponding DM RSs are also located at thesame frequency domain location in the two slots in the subframe.

The Fifth Embodiment

Assuming that in the LTE-A system, the PUSCH of a user equipment 1 istransmitted on three component carriers, and the uplink systembandwidths of the three component carriers are all 20 MHz, andcorrespond to 12 PRBs and 144 subcarriers, 8 PRBs and 96 subcarriers and8 PRBs and 96 subcarriers in frequency domain respectively usingcontinuous resource allocation in each component carrier.

In each component carrier, the UE1 transmits demodulation referencesignals (DM RS) for the PUSCH on the bandwidth occupied by the PUSCH ofthe UE1. The DM RSs on each component carrier are an independentsequence.

The DM RS sequence r₀ ^(PUSCH)(•) on the 0^(th) component carrier isdefined as

r ₀ ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u) ₀ _(,v) ₀ ^((α) ⁰ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thebandwidth occupied by the PUSCH on the component carrier

M_(sc) ^(RS)=M_(sc) ^(PUSCH)=144

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the0^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE(k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence r₁ ^(PUSCH)(•) on the component carrier 1 is definedas

r ₁ ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u) ₁ _(,v) ₁ ^((α) ¹ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth:

M_(sc) ^(RS)=M_(sc) ^(PUSCH)=96

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the1^(st) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence on the component carrier 2 is defined as

r ₂ ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u) ₂ _(,v) ₂ ^((α) ² ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth,

M_(sc) ^(RS)=M_(sc) ^(PUSCH)=96

m=0,1 correspond to two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the2^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The cyclic shift quantities of the DM RS sequences on the componentcarriers 1 and 2 are the same, and the cyclic shift quantity on thecomponent carrier 0 is different, that is α₀≠α₁=α₂.

The group serial numbers of the base sequences of the DM RSs on thecomponent carriers 1 and 2 are the same, while the group serial numberon the component carrier 0 is different, that is u₀≠u₁=u₂. If the grouphopping function is on, group hopping patterns of the DM RS sequences onthe component carriers 1 and 2 are the same, while the group hoppingpattern on the component carrier 0 is different.

The lengths of the DM RS sequences on the three component carrierssatisfy M_(sc) ^(RS)≧6N_(sc) ^(RB)=72, the intragroup sequence serialnumber of the base sequence is 0 or 1.

The base sequences of DM RSs on the component carriers 1 and 2 come fromthe same group and have the same cyclic shift quantity, and theirsequence lengths are the same. In the same slot, the intragroup sequenceserial numbers of the two DM RS sequences are different and satisfy:

v ₂=(v ₁+1) mod 2

If the group hopping function is off while the sequence hopping functionis on, the sequence hopping patterns of the two DM RS sequences aredifferent and just contrary, that is,

v ₀(n _(s))=(v ₂(n _(s))+1) mod 2

The PUSCH of the UE1 is not frequency hopping in the subframe. In eachcomponent carrier, the PUSCH is located at the same frequency domainlocation in two slots in the subframe. Therefore, in each componentcarrier, the corresponding DM RSs are also located at the same frequencydomain location in the two slots in the subframe.

The Sixth Embodiment

Assuming that in the LTE-A system, the PUSCH of a user equipment 1 istransmitted on two component carriers, and the uplink system bandwidthsof the two component carriers are all 15 MHz. Using non-continuousresource allocation on the component carrier 0, the non-continuousbandwidths correspond to 12 PRBs and 144 subcarriers, and 24 PRBs and288 subcarriers in frequency domain respectively. Using continuousresource allocation on the component carrier 1, the non-continuousbandwidth corresponds to 16 PRBs and 192 subcarriers in frequencydomain.

In each component carrier, the UE1 sends demodulation reference signals(DM RS) for the PUSCH on the bandwidth occupied by the PUSCH of the UE1.The DM RSs on each component carrier are an independent sequence.

The DM RS sequence r₀ ^(PUSCH)(•) on the component carrier 0 is definedas

r ₀ ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u) ₀ _(,v) ₀ ^((α) ⁰ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thebandwidth occupied by the PUSCH on the component carrier:

M_(sc) ^(RS)=M_(sc) ^(PUSCH)=432

m=0,1 correspond to the two slots in a subframe (1 ms) respectively.

The DM RS sequence r^(PUSCH,0)(•) on the 0^(th) section of bandwidth is

r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ₀ ^(PUSCH)(m·M _(sc) ^(RS) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,0)−1

and

M_(sc) ^(PUSCH,0)=144

The DM RS sequence r^(PUSCH,1)(•) on the 1^(st) section of bandwidth is:

r ^(PUSCH,1)(m·M _(sc) ^(PUSCH,1) +n)=r ₀ ^(PUSCH)(m·M _(sc) ^(RS) +M_(sc) ^(PUSCH,0) +n)

where

m=0,1

n=0, . . . , M _(sc) ^(PUSCH,1)−1

and

M_(sc) ^(PUSCH,1)=288

That is, the sequence r₀ ^(PUSCH)(•) is divided into two sections, thelength of the 0^(th) section of the sequence is the number 144 ofsubcarriers corresponding to the 0^(th) section of the PUSCH, and thelength of the 1^(st) section of the sequence is the number 288 ofsubcarriers corresponding to the 1^(St) section of the PUSCH.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the0^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence r₁ ^(PUSCH)(•) on the component carrier 1 is definedas

r ₁ ^(PUSCH)(m·M _(sc) ^(RS)+n)=r _(u) ₁ _(,v) ₁ ^((α) ¹ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth

M_(sc) ^(RS)=M_(sc) ^(PUSCH)=192

m=0,1 correspond to the two slots in a subframe (1 ms) respectively.

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the1^(st) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The cyclic shift quantities of the DM RS sequences on the componentcarriers 0 and 1 are different, that is α₀≠α₁₁.

The group serial numbers of the base sequences of the DM RSs on thecomponent carriers 0 and 1 are different, that is, u₀≠u₁. If the grouphopping function is on, group hopping patterns of the DM RS sequences onthe component carriers 1 and 2 are different.

The lengths of the DM RS sequences on the two component carriers satisfyM_(sc) ^(RS)≧6N_(sc) ^(RB)=72, the intragroup sequence serial number ofthe base sequence is 0 or 1. If the group hopping function is off, andthe sequence hopping function is on, the intragroup sequence serialnumbers v₀ and v₁ of the two DM RS sequences respectively vary with theslot n_(s)=0, 1, . . . , 19 in a radio frame.

The PUSCH of the UE1 is not frequency hopping in this subframe. In eachcomponent carrier, the PUSCH is located at the same frequency domainlocation in two slots in the subframe. Therefore, in each componentcarrier, the corresponding DM RSs are also located at the same frequencydomain location in the two slots in the subframe.

The Seventh Embodiment

Assuming that in the LTE-A system, the PUSCH of a user equipment 1 istransmitted on two component carriers, and the uplink system bandwidthsof the two component carriers are all 10 MHz. Using non-continuousresource allocation on the component carrier 0, the non-continuousbandwidths correspond to 12 PRBs and 144 subcarriers, and 24 PRBs and288 subcarriers in frequency domain respectively. Using non-continuousresource allocation on the component carrier 1, the non-continuousbandwidths correspond to 16 PRBs and 192 subcarriers and 12 PRBs and 144subcarriers in frequency domain respectively.

In each component carrier, the UE1 sends demodulation reference signals(DM RS) for the PUSCH on the bandwidth occupied by the PUSCH of the UE1.In each component carrier, the DM RSs on each section of bandwidth arean independent sequence.

The DM RS sequence r₀ ^(PUSCH,0)(•) on the 0^(th) section of bandwidthon the 0^(th) section of bandwidth is:

r ₀ ^(PUSCH,0)(m·M _(sc) ^(RS) +n)=r _(u) ₀ _(,v) ₀ ^((α) ⁰ ₎(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thebandwidth occupied by the PUSCH on the component carrier

M_(sc) ^(RS)=M_(sc) ^(PUSCH,0)=144

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the0^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

r ₀ ^(PUSCH,1)(m·M _(sc) ^(RS) +n)=r _(u) ₀ _(,v) ₀ ^((α) ⁰ ⁾(n)

The DM RS sequence r₀ ^(PUSCH,1)(•) on the first section of bandwidthis:

r ₀ ^(PUSCH,1)(m·M _(sc) ^(RS) +n)=r _(u) ₀ _(,v) ₀ ^((α) ⁰ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth

M_(sc) ^(RS)=M_(sc) ^(PUSCH,0)=288

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding tothe 1^(st) section of the PUSCH transmission. When the sequencer^(PUSCH)(•) is mapped to RE (k,l) of a subframe, the mapping isperformed first in frequency domain (k) and then in time-domain (l) inan ascending order of k and l. The DM RS for the PUSCH in each slot islocated at the fourth one (l=3) of seven normal CP symbols.

The DM RS sequence r₁ ^(PUSCH,0)(•) on the 0^(th) section of bandwidthon the component carrier 1 is

r ₁ ^(PUSCH,0)(m·M _(sc) ^(RS) +n)=r _(u) ₁ _(,v) ₁ ^((α) ¹ ⁾(n)

where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thebandwidth occupied by the PUSCH on the component carrier is

M_(sc) ^(RS)=M_(sc) ^(PUSCH,0)=192

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the0^(th) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE(k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The DM RS sequence r₁ ^(PUSCH)(•) on the first section of bandwidth is

r ₁ ^(PUSCH,1)(m·M _(sc) ^(RS) +n)=r _(u) ₁ _(,v) ₁ ^((α) ¹ ⁾(n) where

m=0,1

n=0, . . . , M _(sc) ^(RS)−1

The sequence length is the number of subcarriers corresponding to thesection of bandwidth

M_(sc) ^(RS)=M_(sc) ^(PUSCH,1)=144

After the sequence r^(PUSCH)(•) is multiplied by a magnitude scalingfactor β_(PUSCH), starting with r^(PUSCH)(0), the sequence r^(PUSCH)(•)is mapped to the same physical resource block set for corresponding the1^(st) section of the PUSCH transmission. When the sequence r^(PUSCH)(•)is mapped to RE (k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l. The DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal CP symbols.

The cyclic shift quantities of the DM RS sequences on the componentcarriers 0 and 1 are different, that is α₀≠α₁. In one component carrier,the cyclic shift quantities of the DM RS sequences on the two sectionsof bandwidths are the same.

The group serial numbers of the base sequences of the DM RSs on thecomponent carriers 0 and 1 are different, that is u₀≠u₁. In onecomponent carrier, the group serial numbers of the base sequences of theDM RSs on the two sections of bandwidth are the same. If the grouphopping function is on, group hopping patterns of the DM RS sequences onthe component carriers 1 and 2 are different; in one component carrier,group hopping patterns of the DM RS sequences on the two sections ofbandwidth are the same.

In two component carriers, the lengths of the DM RS sequences on thefour sections of bandwidth satisfy M_(sc) ^(RS)≧6N_(sc) ^(RB)=72, theintragroup sequence serial number of the base sequence is 0 or 1. If thegroup hopping function is off, and the sequence hopping function is on,the intragroup sequence serial number of the two DM RS sequences in thesame group on one component carrier vary with the slot n_(s)=0, 1, . . ., 19 according to same group hopping pattern in a radio frame.

The PUSCH of the UE1 is not frequency hopping in this subframe. In eachcomponent carrier, the PUSCH is located at the same frequency domainlocation in two slots in the subframe. Therefore, in each componentcarrier, the corresponding DM RSs are also located at the same frequencydomain location in the two slots in the subframe.

The above description is only the embodiments of the present inventionand is not intended to limit the present invention. Variousmodifications and variations to the present invention may be made bythose skilled in the art. Any modification, equivalent substitution andvariation made within the spirit and principle of the present inventionshould be covered in the scope of the appended claims of the presentinvention.

INDUSTRIAL APPLICABILITY

The method and apparatus for transmitting reference signals inaccordance with the present invention solve the problem of transmittingdemodulation reference signals (DM RS) of the PUSCH when a plurality ofcomponent carriers aggregate as well as the problem of transmitting theDM RSs during PUSCH non-continuous resource allocation in one componentcarrier in the LTE-A system.

1. A method for transmitting reference signals comprising: duringcarrier aggregation, a user equipment sending physical uplink sharedchannel (PUSCH) on one or more component carriers, and sendingdemodulation reference signals (DM RS) for the PUSCH on each section ofbandwidth occupied by the PUSCH on each component carrier, wherein a DMRS sequence on a section of bandwidth is an independent sequence or partof an independent sequence and forms an independent sequence with DM RSsequences on multiple sections of bandwidth other than the section ofbandwidth; and the section of bandwidth is a section of continuousbandwidth occupied by the PUSCH on any component carrier, or is any ofthe multiple sections of bandwidth occupied by the PUSCH on anycomponent carrier.
 2. The method according to claim 1, wherein the DM RSsequences on the multiple sections of bandwidth occupied by the PUSCH onthe same component carrier form an independent sequence, and the DM RSsequence on each section of bandwidth is part of the independentsequence.
 3. The method according to claim 1, wherein the DM RS sequenceon each section of bandwidth occupied by the PUSCH on each componentcarrier is an independent sequence.
 4. The method according to claim 1,wherein a base sequence of the DM RS sequence on each section ofbandwidth comes from the same or a different group, when a group hoppingfunction is on, a group serial number u of the DM RS sequence on eachsection of bandwidth varies with a slot in one radio frame, and a grouphopping pattern of the DM RS sequence on each section of bandwidth isthe same or different.
 5. The method according to claim 4, wherein inthe same slot, if base sequences of a plurality of independent sequencescome from the same group and have the same cyclic shift quantity, andlengths of the sequences are the same and greater than or equal to6N_(sc) ^(RB), where N_(sc) ^(RB) is the number of subcarriers occupiedby one physical resource block in frequency domain, then the intragroupsequence serial numbers of the base sequences of the plurality ofindependent sequences are the same or different, when group hoppingfunction is off while sequence hopping function is on, sequence hoppingpatterns of the plurality of independent sequences are the same ordifferent, and the independent sequence is a DM RS sequence on a sectionof bandwidth or a sequence formed collectively from DM RS sequences onmultiple sections of bandwidth.
 6. The method according to claim 4,wherein if base sequences of two independent sequences come from thesame group and have the same cyclic shift quantity, and lengths of thetwo independent sequences are the same and greater than or equal to6N_(sc) ^(RB), where N_(sc) ^(RB) is the number of subcarriers occupiedby one physical resource block in frequency domain, then the intragroupsequence serial numbers v_(i),v_(j)ε{0,1} of the two independentsequences satisfy v_(i)=(v_(j)+1) mod 2; if the group hopping functionis off while the sequence hopping function is on, sequence hoppingpatterns of the two independent sequences satisfyv_(i)(n_(s))=(v_(j)(n_(s))+1) mod 2, and each of the independentsequences is a DM RS sequence on a section of bandwidth or a sequenceformed collectively from DM RS sequences on multiple sections ofbandwidth.
 7. The method according to claim 1, wherein when the DM RSsequence on the section of bandwidth is an independent sequence, the DMRS sequence r^(PUSCH)(•) on the section of bandwidth is:r ^(PUSCH)(m·M _(sc) ^(RS) n)=r_(u,v) ^((α))(n)wherem=0,1n=0, . . . , M _(sc) ^(RS)−1 and the sequence length M_(sc) ^(RS) is thenumber of subcarriers M_(sc) ^(PUSCH) corresponding to the section ofbandwidth, m=0,1 correspond to two slots in one subframe respectively, αis the cyclic shift quantity, u is the group serial number, and v is theintragroup sequence serial number.
 8. The method according to claim 1,wherein when DM RS sequences on R sections of bandwidth are part of theindependent sequence r^(PUSCH)(•), r^(PUSCH)(•) isr ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)wherem=0,1n=0, . . . , R _(sc) ^(RS)−1andM_(sc) ^(RS)=M_(sc) ^(PUSCH) where r_(u,v)(n) is the base sequence, α isthe cyclic shift quantity, u is the group serial number, v is theintragroup sequence serial number; m=0,1 correspond to two slots in asubframe respectively, and M_(sc) ^(PUSCH) is the total number ofsubcarriers corresponding to the R sections of bandwidth, the DM RSsequence r^(PUSCH,r)(•) on the r^(th) section of bandwidth of the Rsections of bandwidths is:${r^{{PUSCH},r}\left( {{m \cdot M_{sc}^{{PUSCH},r}} + n} \right)} = {r^{PUSCH}\left( {{m \cdot M_{sc}^{RS}} + {\sum\limits_{i = 0}^{r - 1}M_{sc}^{{PUSCH},i}} + n} \right)}$wherer=1, . . . , R−1m=0,1n=0, . . . , M _(sc) ^(PUSCH,r)−1 the DM RS sequence r^(PUSCH,0)(•) onthe 0^(th) section of bandwidth is:r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)wherem=0,1n=0, . . . , M _(sc) ^(PUSCH,0)−1 M_(sc) ^(PUSCH,r) is the number ofsubcarriers corresponding to the r^(th) section of bandwidth.
 9. Themethod according to claim 7, wherein after the sequence r^(PUSCH)(•) ismultiplied by a magnitude scaling factor β_(PUSCH), starting withr^(PUSCH)(0), the sequence r^(PUSCH)(•) is mapped to the same physicalresource block set for corresponding PUSCH transmission, when thesequence r^(PUSCH)(•) is mapped to RE (k,l) of a subframe, the mappingis performed first in frequency domain (k) and then in time-domain (l)in an ascending order of k and l, the DM RS for the PUSCH in each slotis located at the fourth one (l=3) of seven normal cyclic prefix symbolsor the third one (l=2) of six extended cyclic prefix symbols.
 10. Anapparatus for transmitting reference signals configured to: duringcarrier aggregation, send demodulation reference signals (DM RS) forPUSCH on each section of bandwidth occupied by the PUSCH on eachcomponent carrier, wherein a DM RS sequence on a section of bandwidth isan independent sequence or part of an independent sequence and forms anindependent sequence with DM RS sequences on multiple sections ofbandwidth other than the section of bandwidth; and the section ofbandwidth is a section of continuous bandwidth occupied by the PUS CH onany component carrier, or is any of the multiple sections of bandwidthoccupied by the PUSCH on any component carrier.
 11. The apparatusaccording to claim 10, wherein the DM RS sequence sent by the apparatussatisfies the following conditions: the DM RS sequences on the multiplesections of bandwidth occupied by the PUSCH on the same componentcarrier form an independent sequence, and the DM RS sequence on eachsection of bandwidth is part of the independent sequence.
 12. Theapparatus according to claim 10, wherein the DM RS sequence sent by theapparatus on each section of bandwidth occupied by the PUSCH on eachcomponent carrier is an independent sequence.
 13. The apparatusaccording to claim 10, wherein the DM RS sequence sent by the apparatussatisfies the following conditions: a base sequence of the DM RSsequence on each section of bandwidth comes from the same or a differentgroup, when a group hopping function is on, a group serial number u ofthe DM RS sequence on each section of bandwidth varies with a slot inone radio frame, and a group hopping pattern of the DM RS sequence oneach section of bandwidth is the same or different.
 14. The apparatusaccording to claim 13, wherein the DM RS sequence sent by the apparatussatisfies the following conditions: in the same slot, if base sequencesof a plurality of independent sequences come from the same group andhave the same cyclic shift quantity, and lengths of the sequences arethe same and greater than or equal to 6N_(sc) ^(RB), where N_(sc) ^(RB)is the number of subcarriers occupied by one physical resource block infrequency domain, then the intragroup sequence serial numbers of thebase sequences of the plurality of independent sequences are the same ordifferent, when group hopping function is off while sequence hoppingfunction is on, sequence hopping patterns of the plurality ofindependent sequences are the same or different, and the independentsequence is a DM RS sequence on a section of bandwidth or a sequenceformed collectively from DM RS sequences on multiple sections ofbandwidth.
 15. The apparatus according to claim 14, wherein the DM RSsequence sent by the apparatus satisfies the following conditions: ifbase sequences of two independent sequences come from the same group andhave the same cyclic shift quantity, and lengths of the two independentsequences are the same and greater than or equal to 6N_(sc) ^(RB), whereN_(sc) ^(RB) is the number of subcarriers occupied by one physicalresource block in frequency domain, then the intragroup sequence serialnumbers v_(i),v_(j)ε{0,1} of the two independent sequences satisfyv_(i)=(v_(j)+1) mod 2; if the group hopping function is off while thesequence hopping function is on, sequence hopping patterns of the twoindependent sequences satisfy v_(i)(n_(s))=(v_(j)(n_(s))+1) mod 2, andeach of the independent sequences is a DM RS sequence on a section ofbandwidth or a sequence formed collectively from DM RS sequences onmultiple sections of bandwidth.
 16. The apparatus according to claim 10,wherein the DM RS sequence sent by the apparatus satisfies the followingconditions: when the DM RS sequence on the section of bandwidth is anindependent sequence, the DM RS sequence r^(PUSCH)(•) on the section ofbandwidth is:r ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((α))(n)wherem=0,1n=0, . . . , M _(sc) ^(RS)−1 and the sequence length M_(sc) ^(RS) is thenumber of subcarriers M_(sc) ^(PUSCH) corresponding to the section ofbandwidth, m=0,1 correspond to two slots in one subframe respectively, αis the cyclic shift quantity, u is the group serial number, and v is theintragroup sequence serial number.
 17. The apparatus according to claim10, wherein the DM RS sequence sent by the apparatus satisfies thefollowing conditions: when DM RS sequences on R sections of bandwidthare part of the independent sequence r^(PUSCH)(•), r^(PUSCH)(•) isr ^(PUSCH)(m·M _(sc) ^(RS) +n)=r _(u,v) ^((⋆))(n)wherem=0,1n=0, . . . , M _(sc) ^(RS)−1andM_(sc) ^(RS)=M_(sc) ^(PUSCH) where r_(u,v)(n) is the base sequence, α isthe cyclic shift quantity, u is the group serial number, v is theintragroup sequence serial number; m=0,1 correspond to two slots in asubframe respectively, and M_(sc) ^(PUSCH) is the total number ofsubcarriers corresponding to the R sections of bandwidth, the DM RSsequence r^(PUSCH,r)(•) on the r^(th) section of bandwidth of the Rsections of bandwidths is:${r^{{PUSCH},r}\left( {{m \cdot M_{sc}^{{PUSCH},r}} + n} \right)} = {r^{PUSCH}\left( {{m \cdot M_{sc}^{RS}} + {\sum\limits_{i = 0}^{r - 1}M_{sc}^{{PUSCH},i}} + n} \right)}$wherer=1, . . . , R−1m=0,1n=0, . . . , M _(sc) ^(PUSCH,r)−1 the DM RS sequence r^(PUSCH,0)(•) onthe 0^(th) section of bandwidth is:r ^(PUSCH,0)(m·M _(sc) ^(PUSCH,0) +n)=r ^(PUSCH)(m·M _(sc) ^(RS) +n)wherem=0,1n=0, . . . , M _(sc) ^(PUSCH,0)−1 M_(sc) ^(PUSCH,r) is the number ofsubcarriers corresponding to the r^(th) section of bandwidth.
 18. Theapparatus according to claim 16, wherein the apparatus is furtherconfigured to: after the sequence r^(PUSCH)(•) is multiplied by amagnitude scaling factor β_(PUSCH) starting with r^(PUSCH)(0), map thesequence r^(PUSCH)(•) to the same physical resource block set forcorresponding PUSCH transmission, and when the sequence r^(PUSCH)(•) ismapped to RE(k,l) of a subframe, perform the mapping first in frequencydomain and then in time-domain in an ascending order of k and l, the DMRS for the PUSCH in each slot being located at the fourth one (l=3) ofseven normal cyclic prefix symbols or the third one (l=2) of sixextended cyclic prefix symbols.
 19. The method according to claim 8,wherein after the sequence r^(PUSCH)(•) is multiplied by a magnitudescaling factor β_(PUSCH), starting with r^(PUSCH)(0) the sequencer^(PUSCH)(•) is mapped to the same physical resource block set forcorresponding PUSCH transmission, when the sequence r^(PUSCH)(•) ismapped to RE(k,l) of a subframe, the mapping is performed first infrequency domain (k) and then in time-domain (l) in an ascending orderof k and l, the DM RS for the PUSCH in each slot is located at thefourth one (l=3) of seven normal cyclic prefix symbols or the third one(l=2) of six extended cyclic prefix symbols.
 20. The apparatus accordingto claim 17, wherein the apparatus is further configured to: after thesequence r^(PUSCH)(•) is multiplied by a magnitude scaling factorβ_(PUSCH), starting with r^(PUSCH)(0), map the sequence r^(PUSCH)(•) tothe same physical resource block set for corresponding PUSCHtransmission, and when the sequence r^(PUSCH)(•) is mapped to RE(k,l) ofa subframe, perform the mapping first in frequency domain and then intime-domain in an ascending order of k and l, the DM RS for the PUSCH ineach slot being located at the fourth one (l=3) of seven normal cyclicprefix symbols or the third one (l=2) of six extended cyclic prefixsymbols.